---
title: "Application, Host, and User Keys"
framework: corefoundation
role: collectionGroup
role_heading: API Collection
path: corefoundation/application-host-and-user-keys
---

# Application, Host, and User Keys

Keys used to specify the common preference domains.

## Overview

Overview Not all combinations of application, host, and user are supported preference domains. Specifically, kCFPreferencesAnyHost is not supported in any combination with other options.

## Topics

### Constants

- [kCFPreferencesAnyApplication](corefoundation/kcfpreferencesanyapplication.md)
- [kCFPreferencesAnyHost](corefoundation/kcfpreferencesanyhost.md)
- [kCFPreferencesAnyUser](corefoundation/kcfpreferencesanyuser.md)
- [kCFPreferencesCurrentApplication](corefoundation/kcfpreferencescurrentapplication.md)
- [kCFPreferencesCurrentHost](corefoundation/kcfpreferencescurrenthost.md)
- [kCFPreferencesCurrentUser](corefoundation/kcfpreferencescurrentuser.md)